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1.Find the perimeter of an isosceles triangle whose base is 40 cm and whose base angle is 70". |
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Answer» he triangle is ISOSCELES, the other two sides have EQUAL length. Call the length of each side .DRAW a perpendicular from vertex to the base and recall that this is also a bisector of base. Therefore you get a right triangle with a leg and one angle . The other side can be obtained by applying cosine ratio :Add up the sides to get the perimeter |
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